From: Lan Tianyu <tianyu.lan@xxxxxxxxx>
Some machines don't provide _TZD. So add check of "_TZD" availability
before doing futher operations. This patch also adds the check of
evaluating result.
Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
---
drivers/acpi/thermal.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index 09f9340..6809fbd 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -492,11 +492,12 @@ static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
break;
}
- if (flag & ACPI_TRIPS_DEVICES) {
+ if ((flag & ACPI_TRIPS_DEVICES)
+ && acpi_has_method(tz->device->handle, "_TZD")) {
memset(&devices, 0, sizeof(struct acpi_handle_list));
status = acpi_evaluate_reference(tz->device->handle, "_TZD",
NULL, &devices);
- if (memcmp(&tz->devices, &devices,
+ if (ACPI_SUCCESS(status) && memcmp(&tz->devices, &devices,
sizeof(struct acpi_handle_list))) {
memcpy(&tz->devices, &devices,
sizeof(struct acpi_handle_list));
--
1.8.4.rc0.1.g8f6a3e5.dirty
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